/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.mapreduce.example;

import org.msgpack.annotation.Message;
import org.sss.mapreduce.datatype.Packable;

@Message
public class PackableVector implements Packable {
  public int num;  // num of non zero element
  public int [] indices;
  public double [] values;

  @Override
  public int slot() {
    return this.hashCode();
  }
  
  @Override
  public long getRoughSize() {
    return 12 * num + 4;
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < num; i++) {
      sb.append("(");
      sb.append(indices[i]);
      sb.append(":");
      sb.append(values[i]);
      sb.append(") ");
    }
    return sb.toString(); 
  }
  
  public static PackableVector genRandomVec(int size, int nonzero) {
    PackableVector v = new PackableVector();
    v.num = nonzero;
    v.indices = new int[v.num];
    v.values= new double[v.num];

    for (int i = 0; i < v.num; i++) {
      int index = (int)(Math.random() * size); 
      double value = Math.random();
      v.indices[i] = index;
      v.values[i]= value;
    }
    return v;
  }
}
